What does "sally" mean?

Additional senses

1. 2.A rushing or bursting forth; a quick issue; a sudden eruption; specifically, an issuing of troops from a place besieged to attack the besiegers; a sortie. Sallies were made by the Spaniards, but they were beaten in with loss. Bacon.
2. 3.An excursion from the usual track; range; digression; deviation. Every one shall know a country better that makes often sallies into it, and traverses it up and down, than he that . . . goes still round in the same track. Locke.
3. 4.A flight of fancy, liveliness, wit, or the like; a flashing forth of a quick and active mind. The unaffected mirth with which she enjoyed his sallies. Sir W. Scott.
4. 5.Transgression of the limits of soberness or steadiness; act of levity; wild gayety; frolic; escapade. The excursion was esteemed but a sally of youth. Sir H. Wotton. Sally port. (a) (Fort.) A postern gate, or a passage underground, from the inner to the outer works, to afford free egress for troops in a sortie. (b) (Naval) A large port on each quarter of a fireship, for the escape of the men into boats when the train is fired; a large port in an old-fashioned three-decker or a large modern ironclad.